RESTON, VA, May 21, 2010 – comScore, Inc. (NASDAQ: SCOR), a leader in measuring the digital world, today released its Q1 2010 U.S. retail e-commerce sales estimates, which showed that online retail spending neared $34 billion for the quarter, up 10 percent versus year ago. The strong acceleration represented the first time growth rates reached double-digits since the second quarter of 2008.

“The first quarter returned the U.S. retail e-commerce market to healthy double-digit growth rates,” said comScore chairman Gian Fulgoni. “While these spending gains provide reason for optimism, we should note that upper-income households are currently shouldering much of the growth. Should the economy falter in the second half of the year and upper-income consumers return to a savings mode, we could still see growth decelerate. But for the time being, this momentum is encouraging.”

Other highlights from Q1 include:

Growth in the first quarter was predominantly driven by upper-income consumers, with spending among the $100,000+ household income segment up 14 percent.

Larger online retailers continued to generate higher growth rates than smaller retailers, but the smaller retailers are finally beginning to see positive growth once again.

Webinar Series: State of the U.S. Online Retail Economy through Q1 2010

Join Mr. Fulgoni as he presents an update of the state of the U.S. online retail economy through Q1 2010 in a live webinar on Thursday, May 27 at 2 p.m. ET/1 p.m. CT.

The webinar presentation will include an overview of changes in consumers’ online spending patterns through Q1 2010, survey findings that highlight consumer sentiments regarding the economy, as well as an analysis of spending patterns across key product categories, retailer sectors and consumer demographic segments.

About comScorecomScore, Inc. (NASDAQ: SCOR) is a global leader in measuring the digital world and preferred source of digital marketing intelligence. For more information, please visit www.comscore.com/companyinfo.